Laminated container



March 26, 1935. 5. SMITH 1,995,523

LAMINATED CONTAINER Filed Feb. 2'7, 1953 l 2 Sheets-Sheet 1 awe/WM SwanSmilh March 26, 1935. s. SMITH 1,995,523

LAMINATED CONTAINER Filed Feb. 27, 1935 2 Sheets-Sheet 2 Swan Smi H 1Patented Mar. 26, 1%35 re atta LAPMNATED CONTER Smith, White Bear, Minn,assignor to David C. Shepard, St. Paul, 1'

Swan

HEISSUED i :l. ill

Application February 27, 1933, Serial No. 658,689

12 (Claims.

My invention relates to laminated containers and has for its object toprovide a container and a method of forming the same, whereby a conicalcontainer may be constructed without waste of material.

Another object of the invention resides in providing a container havinga bottom formed with a flange extending downwardly therefrom and infurther providing a wall structure built about said flange.

An object of the invention resides in providing a container in which thewall structure is formed from sheets of paper glued one upon the otherand of a width greater.than the height of the container.

A still further object of the invention resides in providing a containerin which the sheets used in the construction of the Wall structure areindividually turned back at the lower marginal portion thereof and gluedto the flange of the bottom and to one another.

An object of the invention resides in' providing a laminated papercontainer constructed of sheets of paper formed to overlap at their endsand in further constructing the sheets so that the width of the overlapvaries throughout the length of the container.

Another object of the invention resides in constructing the containerconical and in utilizing sheets of uniform length to form the varyingoverlap.

A feature of the invention resides in utilizing sheets for the purposein which the ends thereof .are parallel to one another.

A still further object of the invention resides in utilizing sheetshaving the upper and lower edges thereof curved and of the same degreeof curvaure. Anobject of the invention resides in utilizing a pluralityof said sheets and in arranging them one upon the other and in furtherconstructing said sheets with such a degree of curvature that the uppercurved edges of the successive sheets placed one upon the other lie incontinuation of one another.

A still further object of the invention resides in employing a metalhoop disposed between the laminations of the wall structure of thecontainer and in placing said hoop in proximity to the flange of thebottom.

An object of the invention resides in arranging said hoop so as toproject upwardly above the upper surface of the bottom to reinforce thecontainer at the juncture between the wall struc ture and bottom.

Another object of the invention resides in providing a method ofconstructing laminated paper containers which consists in wrappingsheets of paper one at a time about a mandrel against which a flangedbottom is held and in gluing the same to the flange of the bottom and toone another and which further consists in arranging the sheets so-thatthe lower marginal portions thereof normally project outwardly beyondthe ends of the flange and which further consists in individuallyturning said projecting marginal portions of the sheets back upon theinner surface of the flange as the sheets are applied and in gluing thesame to said flange and to one another.

Other objects of the invention residein the novel combination andarrangement of parts and in the details of construction hereinafterillustrated and/or described.

In the drawings:

Fig. 1 is a perspective View of a container illustrating an embodimentof my invention.

Fig. 2 is a perspective view illustrating the method of constructing thecontainer and showing the container in inverted position.

Fig. 3 is a perspective view of the bottom of the container detachedtherefrom and viewed from the underside thereof.

Fig. 4- is a perspective viewof the hoop used with the container.

Fig, 5 is a developed'view of the blanks from which the wall structureof the container is constructed illustrating the method of cutting thesame from a roll of paper.

Fig. 6 is a perspective view of a portion of the finished containershown in Fig. 1, viewed from the underside thereof. v

Fig. 7 a sectional detail view taken on line 77 of Fig. 1 and drawn toan enlarged scale.

Fig. 8 is a view similar to Fig. '7 showing the manner of applying theindividual sheets of the wall structure to the bottom. e

In the construction of conical laminated containers and particularlycontainers formed of paper, considerable waste has heretofore occurreddue to the necessity of cutting the sheets from which the container isconstructed in the form of a truncated segment of a circle. In addition,considerable difficulty has been encoun tered in properly securing thebottom to the wall structure and in forming a sufliciently rigid bottomstructure to stand up under the conditions to which the container may besubjected. The present invention provides a container in which thesedisadvantages are entirely overcome and by means of which sheets may beout without waste, the sheets being arranged to overlap and the overlapat the ends of the sheet and the marginal portion at the lower edgesthereof being utilized in the formation of the container. Thesedisadvantages are further eliminated by turning the sheets one at a timeabout the flange of the bottom so as to equalize the tension in all ofthe sheets and by further inserting a metal hoop between the varioussheets forming the wall structure of the container, to stiffen andreinforce the same.

lVLv invention comprises a container illustrated at A in Fig. 1 which isparticularly adapted for use in shippingbutter and similar commodities.This container comprises a wall structure 10 having a bottom 11 securedthereto-and open at its upper end as indicated at 12. A hoop 13encircles the container at the upper end thereof. Any suitable cover maybe used with the container and such construction forming no particularfeature of this invention, has not been illustrated in this application.

The bottom 11 may be constructed of paper or any other suitablematerial. When constructed of paper a number of sheets of paper whichare indicated at 14 are employed which are circular in form and whichare of a diameter somewhat greater than the diameter of the container atthe lower end thereof. These sheets are glued one to the other andbefore the glue has set are placed in suitable dies and pressed to forma planiform portion 15 adapted to extend across the bottom of thecontainer and a flange 16 de- 1 pending from the planiform portionthereof as clearly shown in Figs. 3, '7 and 8 and adapted to lie againstthe inner surface of the container. This bottom is then dried either inthe atmosphere or in an oven to cause the glue to set, or, if preferred,heat may be applied in the dies so that the bottom is caused to take thedesired form when removed from the dies. If desired, the flange 16 mayissue at right angles to the planiform portion 15 of the bottom 11 inwhich case,

the male die member is easily withdrawn from the bottom after the samehas been formed. If, however, the flange 16 is desired to taper toconform to the surface of the container, the same may be accomplished byfirst constructing the flange to lie at right angles to the planiformportion by pressing the same in suitable dies'and thereafter and beforethe glue is set, forcing the flange into a suitable conical hoop wherebythe free edge of the flange is drawn together and in thereafter causingthe glue to set and to give the flange a permanent form.

For building up the wall structure of the container individual sheets ofpaper 19 are employed which are cuttransversely from a roll of paper,the unrolled portion of which is indicated at 30. The sheets 19 are of alength equal to the width of the paper 30 and the ends 31 and 32 ofthese sheets which are formed through the lateral edges of the papercoming from the roll and are parallel to one another. The sheets 19 aresevered from the roll by means of a cutter traveling in an arc of acircle. The are of the circle is such that when the sheets are rolledupon a suitable mandrel, the upper edge 25 of the sheet forms a truecircle at the open end of the container. The next adjacent sheet issevered from the roll by means of the same cutter traveling in the sameare thereby forming the lower edge 26 of the sheet with the same degreeof curvature as the upper edge. Due to the fact that the container is inthe shape of a frustrum of a cone a true circle at the lower end wouldbe formed by -a curved line 33 concentric with the circle of the edge25. By means of this expedient a crescentshaped band 34 of material isleft at the lower marginal portion of the sheet which band is utilizedin the formation of the container as will be presently described.Likewise the ends 26 and 29 of the sheet 19 are caused to overlap in theformation of the wall structure of the container, which overlap isutilized to stiffen and reinforce the container.

After the bottom is properly cured the wall structure is built upon thesame in the following manner: A mandrel diagrammatically indicated at 17in Figs. 2 and 8 is employed which is in the shape of a frustrum of acone and which is of dimensions corresponding with the inner dimensionsof the finished container. The flange 16 of the bottom 11 is of suchshape and dimensions as to lie in continuation of the surface of themandrel 1'7 when applied to the end thereof. In the construction of thewall structure the mandrel 17 is mounted upon a suitable support and thebottom 11 held against the end 18 thereof with the outer surface of theflange 16 lying in continuation of the surface of said mandrel. Glue isthen applied to both the inner and outer surfaces of the flange 16 ofsaid bottom. A sheet of paper 19 cut as previously described is thenwrapped about the mandrel with the lower marginal portion 20 thereofprojecting outwardly below the free edge 21 of the flange 16 as shown indotted lines in Fig. 8. -Glue is then applied to the end of the sheet 19first applied to the mandrel which is designated by the referencenumeral 28 and the other end 29 of the sheet caused to overlap saidlast-named portion of the sheet and to form a joint extendinglongitudinally of the container and indicated in its entirety by thereference numeral 39. Due to the particular shape of the sheet, theoverlap is somewhat in the shape of a trapezoid increasing in widththroughout the length of the container and being of greatest Width atthe lower end thereof as clearly shown in Figs. 1 and 2. As the sheet isapplied, the same adheres to the outer coated surface of the flange 16of the bottom 11. After the sheet has been so applied and the endsthereof secured together, the marginal portion 20 of the sheet isturnedinwardly about the free edge 21 of flange 16 and caused to adhereto the coated inner surface 24 of said flange. Due to the particularcurvature of the upper edge 25 of the sheet 19, the same forms a truecircle for the open upper end of the container. Since the lower edge ofthe sheet, which I have designated by the reference numeral 26, has thesame curvature as the upper edge, the same will not form a true circlewhen turned inwardly upon the inner surface 24 of flange 16. Sheet 19is, however, so arranged that the medial portion 27 of the sheet justclears the under surface of the planiform portion 15 of bottom 11. Thiscauses the edge 26 to recede from said bottom as best shown in Figs. 2,6 and 8, the marginal portion at the ends 28 and 29 of the sheetextending well inwardly of the lower edge 21 of the flange 16. The exactposition of the crescent shaped band 34 of the sheet can best bedetermined by an inspection of Fig. '7 which illustrates the positionofthe corresponding part of the subsequent sheets.

After the first sheet 19 has been applied and glued to the flange 16 ofbottom 11, other sheets .in Fig. 1.

one another is illustrated in Fig. 2 in which the.

sheet 35 has been shown as partly wrapped about the mandrel and securedto the sheet 19. Where six sheets would ordinarily be used in theconstruction of a container to cause the desired.

strength, with my invention the sheets may be made of sufiicient lengthand only flve'sheets employed- Where five sheets are utilized the jointformed at the ends of each sheet would be disposed equidistant about thecircumference of the container so that the overlap of the various sheetswould be uniformly distributed throughout the circumference of thecontainer and a container of uniform strength throughout would result.This would be accomplished by rotating the mandrel 17 through one-fifthof a revolution and applying the next sheet at exactly the same locationwith respect to the support for the mandrel as the first sheet. Themandrel would then be rotated another fifth of a revolution for eachsucceeding sheet until all of the sheets had been applied. As each sheetis applied the marginal portion 20 thereof at the lower'edge of thesheet is turned back upon the corresponding marginal portion of thepreviously applied sheet so that all of the said marginal portionsareglued together and to the flange 16 of the bottom. Due to theconstruction of the sheets as previously described, the medial por tions27 of the sheet become distributed about the inner surface 24 of flange16, whereby the doubled back part of the wall structure is of uniformthickness about the circumference of the flange and gradually tapers offto \a single thickness at the juncture of the flangellfi with theplaniform portion 15 of the bottom 11. The particular manner in whichthe various sheets lie one upon the other within the flange 16 is bestshown in Fig. 6.

The joints 39 of the various sheets, as previously explained, areequally distributed about the circumference of the wall structure of thecontainer. The exact relation of these joints of several of the sheetsare shown in dotted lines At such localities, six thicknesses ofmaterial are present which give the container the desired strength atsuch localities. Intermediate the said joints at localitiesdesignatedlength of the sheets is then selected so that the apexes 42 formedbetween the edges 31 and 32 of juxtaposed sheets lie at such localities.The container is then of a minimum strength below such elevationequivalent to a container constructed of six sheets of paper and abovesuch locality of a minimum strength of a container constructed of fivesheets of paper. The joints 39 in addition to giving circumferentialstrength to the container form ribs extending lengthwise of thecontainer which serve to stiffen the same and to lend longitudinalrigidity thereto. In this manner a much stifier container can be formedthan where the sheets of paper used in the construction of the bodystructuresare out exactly to shape and the surplus discarded.

Where the container is to receive rough handling a reinforcing hoop 43shown in detail in Fig. 4 is employed which is imbedded within theinterior of the wall structure 10. This hoop consists of a band of metalriveted, welded or otherwise secured together at its ends as designatedat 44. This hoop is imbedded in between the layers of paper as the sameare applied tothe mandrel. Where five sheets are utilized, sheets 19 and35 are first placed upon the mandrel and glued to the bottom 11 and toone another. Hoop 43 is then forced over the end of the bottom andupon'the outer surface of the sheet 35 until the lower edge of said hooplies substantially flush with the lower edge 21 of the flange 16. Theother sheets 36, 37 and 38 are then applied as previously describedenveloping the said hoop and causing the same to become firmly imbeddedwithin the interior of the wall structure proper. The hoop 43 is of suchheight that the upper end 46 thereof extends well above the uppersurface 47 of the planiform portion 15 of bottom 11. This serves toreinforce the container at the juncture bethe. formation of the bodystructure which would ordinarily be wasted are utilized to give bothcircumferential and longitudinal rigidityto the container and to reducethe total number of sheets of paper necessary. The container can beconstructed in an extremely simple and expeditious manner, there beingno waste to be handled and to be removed from the machine by means ofwhich the container is built. By individually turning back the marginalportions of the container at the lower edge of the sheets used in thewall structure equal'tension is placed upon each sheet and a muchstronger and more substantial construction results. By the use of thehoop imbedded within the body structure of the container, rigidity isgiven to the flange thereof. At the same time shearing of the wallstructure of the container at the juncture of the same at the bottom isentirely prevented.

Changes in the specific form of my invention, as' herein disclosed, maybe made within the scope of what isclaimed without departing from thespirit of my invention.

Having described my invention, what I claim as new and desire to protectby Letters Patent 1. A paper container comprising sheets of paper gluedone upon the other to form a wall structure for the container, saidsheets overlapping at their ends, the amount of overlap of said sheetsvarying throughout the length of the container.

2. A paper container comprising sheets of paper glued one upon the otherto form a wall structure for the container, said sheets beingconstructed at their ends to form an overlapping joint at the ends ofthe sheet in the shape of a trapezoid with the base of the trapezoid atthe bottom of the container.

3. A paper container comprising sheets of paper glued one upon. the.nther to form a wall structure for the container, said sheetsoverlapping at their ends, the amount of overlap of said sheets varyingthroughout the length of the container, and being greatest at the bottomof the container.

4. A paper container comprising a number of sheets of paper glued oneupon the other to form a wall structure for the container, said sheetsoverlapping at their ends, the amount of overlap of said sheets varyingthroughout the length of the container, said sheets being all arrangedwith the greatest amount of end of the container.

5, Apaper container comprising a number of sheets of paper glued oneupon the other to form a. wall structure for the container, said sheetsoverlapping at their ends, the amount of overlap of said sheets varyingthroughout the length of the container, said sheets being all arrangedwith the greatest amount of overlap at the bottom of the container.-

6. A conical container comprising a wall struc ture formed of sheets ofpaper glued one upon the other, said sheets being of a uniform length toprovide an overlap at the ends 'of the sheet varying in width throughoutthe length of the container. i

7. A conical container comprising a wall structure formed of sheets ofpaper glued one upon the other, said sheets having parallel ends toprovide an overlap at the ends of the said sheets varying in widththroughout the length of the container.

8. A conical container comprising a wall structure formed of sheets ofpaper glued one upon the other, said sheets being formed with curvedupper and lower edges, both of the same curvature, the edges at one endof the container lying in alignment with'one another, and the overlap atthe same 9. A conical container comprising a. wall structure formed ofsheets of paper glued one upon the other, said sheets being formed withcurved upper and lower edges, both of the same curvature, the curvatureof the edges of the sheets at the upper end of the container being suchas to cause said edges to lie in alignment and the marginal portions ofthe sheets at the other end of the container being folded back and gluedtogether.

10. A conical container comprising a bottom getherand to said flange.

11. A container comprising a bottom having a flange issuing downwardlytherefrom, a wall structure comprising sheets of paper glued one uponthe other, the lower marginal portions of said sheets being folded backand glued to said flange and to one another, and a metal hoop imbeddedbetween said sheets of'paper in proximity to the lower edge of saidflange.

12. A container comprising a bottom having a flange issuing downwardlytherefrom, a wall structure comprising sheets of paper glued one uponthe other, the lower marginal portions of said sheets being folded backand glued to said flange and to one another, and a metal hoop imbeddedbetween said sheets of paper in proximity to the lower edge of saidflange, said hoop extending upwardly beyond the upper surface of saidbottom, and reinforcing the container at the juncture between the bottomand wall structure.

' SWAN SMITH.

